1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * af_alg: User-space algorithm interface 2 * af_alg: User-space algorithm interface
4 * 3 *
5 * This file provides the user-space API for a 4 * This file provides the user-space API for algorithms.
6 * 5 *
7 * Copyright (c) 2010 Herbert Xu <herbert@gond 6 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
>> 7 *
>> 8 * This program is free software; you can redistribute it and/or modify it
>> 9 * under the terms of the GNU General Public License as published by the Free
>> 10 * Software Foundation; either version 2 of the License, or (at your option)
>> 11 * any later version.
>> 12 *
8 */ 13 */
9 14
10 #include <linux/atomic.h> 15 #include <linux/atomic.h>
11 #include <crypto/if_alg.h> 16 #include <crypto/if_alg.h>
12 #include <linux/crypto.h> 17 #include <linux/crypto.h>
13 #include <linux/init.h> 18 #include <linux/init.h>
14 #include <linux/kernel.h> 19 #include <linux/kernel.h>
15 #include <linux/key.h> <<
16 #include <linux/key-type.h> <<
17 #include <linux/list.h> 20 #include <linux/list.h>
18 #include <linux/module.h> 21 #include <linux/module.h>
19 #include <linux/net.h> 22 #include <linux/net.h>
20 #include <linux/rwsem.h> 23 #include <linux/rwsem.h>
21 #include <linux/sched.h> <<
22 #include <linux/sched/signal.h> <<
23 #include <linux/security.h> 24 #include <linux/security.h>
24 #include <linux/string.h> <<
25 #include <keys/user-type.h> <<
26 #include <keys/trusted-type.h> <<
27 #include <keys/encrypted-type.h> <<
28 25
29 struct alg_type_list { 26 struct alg_type_list {
30 const struct af_alg_type *type; 27 const struct af_alg_type *type;
31 struct list_head list; 28 struct list_head list;
32 }; 29 };
33 30
>> 31 static atomic_long_t alg_memory_allocated;
>> 32
34 static struct proto alg_proto = { 33 static struct proto alg_proto = {
35 .name = "ALG", 34 .name = "ALG",
36 .owner = THIS_MODULE, 35 .owner = THIS_MODULE,
>> 36 .memory_allocated = &alg_memory_allocated,
37 .obj_size = sizeof(struc 37 .obj_size = sizeof(struct alg_sock),
38 }; 38 };
39 39
40 static LIST_HEAD(alg_types); 40 static LIST_HEAD(alg_types);
41 static DECLARE_RWSEM(alg_types_sem); 41 static DECLARE_RWSEM(alg_types_sem);
42 42
43 static const struct af_alg_type *alg_get_type( 43 static const struct af_alg_type *alg_get_type(const char *name)
44 { 44 {
45 const struct af_alg_type *type = ERR_P 45 const struct af_alg_type *type = ERR_PTR(-ENOENT);
46 struct alg_type_list *node; 46 struct alg_type_list *node;
47 47
48 down_read(&alg_types_sem); 48 down_read(&alg_types_sem);
49 list_for_each_entry(node, &alg_types, 49 list_for_each_entry(node, &alg_types, list) {
50 if (strcmp(node->type->name, n 50 if (strcmp(node->type->name, name))
51 continue; 51 continue;
52 52
53 if (try_module_get(node->type- 53 if (try_module_get(node->type->owner))
54 type = node->type; 54 type = node->type;
55 break; 55 break;
56 } 56 }
57 up_read(&alg_types_sem); 57 up_read(&alg_types_sem);
58 58
59 return type; 59 return type;
60 } 60 }
61 61
62 int af_alg_register_type(const struct af_alg_t 62 int af_alg_register_type(const struct af_alg_type *type)
63 { 63 {
64 struct alg_type_list *node; 64 struct alg_type_list *node;
65 int err = -EEXIST; 65 int err = -EEXIST;
66 66
67 down_write(&alg_types_sem); 67 down_write(&alg_types_sem);
68 list_for_each_entry(node, &alg_types, 68 list_for_each_entry(node, &alg_types, list) {
69 if (!strcmp(node->type->name, 69 if (!strcmp(node->type->name, type->name))
70 goto unlock; 70 goto unlock;
71 } 71 }
72 72
73 node = kmalloc(sizeof(*node), GFP_KERN 73 node = kmalloc(sizeof(*node), GFP_KERNEL);
74 err = -ENOMEM; 74 err = -ENOMEM;
75 if (!node) 75 if (!node)
76 goto unlock; 76 goto unlock;
77 77
78 type->ops->owner = THIS_MODULE; 78 type->ops->owner = THIS_MODULE;
79 if (type->ops_nokey) 79 if (type->ops_nokey)
80 type->ops_nokey->owner = THIS_ 80 type->ops_nokey->owner = THIS_MODULE;
81 node->type = type; 81 node->type = type;
82 list_add(&node->list, &alg_types); 82 list_add(&node->list, &alg_types);
83 err = 0; 83 err = 0;
84 84
85 unlock: 85 unlock:
86 up_write(&alg_types_sem); 86 up_write(&alg_types_sem);
87 87
88 return err; 88 return err;
89 } 89 }
90 EXPORT_SYMBOL_GPL(af_alg_register_type); 90 EXPORT_SYMBOL_GPL(af_alg_register_type);
91 91
92 int af_alg_unregister_type(const struct af_alg 92 int af_alg_unregister_type(const struct af_alg_type *type)
93 { 93 {
94 struct alg_type_list *node; 94 struct alg_type_list *node;
95 int err = -ENOENT; 95 int err = -ENOENT;
96 96
97 down_write(&alg_types_sem); 97 down_write(&alg_types_sem);
98 list_for_each_entry(node, &alg_types, 98 list_for_each_entry(node, &alg_types, list) {
99 if (strcmp(node->type->name, t 99 if (strcmp(node->type->name, type->name))
100 continue; 100 continue;
101 101
102 list_del(&node->list); 102 list_del(&node->list);
103 kfree(node); 103 kfree(node);
104 err = 0; 104 err = 0;
105 break; 105 break;
106 } 106 }
107 up_write(&alg_types_sem); 107 up_write(&alg_types_sem);
108 108
109 return err; 109 return err;
110 } 110 }
111 EXPORT_SYMBOL_GPL(af_alg_unregister_type); 111 EXPORT_SYMBOL_GPL(af_alg_unregister_type);
112 112
113 static void alg_do_release(const struct af_alg 113 static void alg_do_release(const struct af_alg_type *type, void *private)
114 { 114 {
115 if (!type) 115 if (!type)
116 return; 116 return;
117 117
118 type->release(private); 118 type->release(private);
119 module_put(type->owner); 119 module_put(type->owner);
120 } 120 }
121 121
122 int af_alg_release(struct socket *sock) 122 int af_alg_release(struct socket *sock)
123 { 123 {
124 if (sock->sk) { !! 124 if (sock->sk)
125 sock_put(sock->sk); 125 sock_put(sock->sk);
126 sock->sk = NULL; <<
127 } <<
128 return 0; 126 return 0;
129 } 127 }
130 EXPORT_SYMBOL_GPL(af_alg_release); 128 EXPORT_SYMBOL_GPL(af_alg_release);
131 129
132 void af_alg_release_parent(struct sock *sk) 130 void af_alg_release_parent(struct sock *sk)
133 { 131 {
134 struct alg_sock *ask = alg_sk(sk); 132 struct alg_sock *ask = alg_sk(sk);
135 unsigned int nokey = atomic_read(&ask- !! 133 unsigned int nokey = ask->nokey_refcnt;
>> 134 bool last = nokey && !ask->refcnt;
136 135
137 sk = ask->parent; 136 sk = ask->parent;
138 ask = alg_sk(sk); 137 ask = alg_sk(sk);
139 138
140 if (nokey) !! 139 lock_sock(sk);
141 atomic_dec(&ask->nokey_refcnt) !! 140 ask->nokey_refcnt -= nokey;
>> 141 if (!last)
>> 142 last = !--ask->refcnt;
>> 143 release_sock(sk);
142 144
143 if (atomic_dec_and_test(&ask->refcnt)) !! 145 if (last)
144 sock_put(sk); 146 sock_put(sk);
145 } 147 }
146 EXPORT_SYMBOL_GPL(af_alg_release_parent); 148 EXPORT_SYMBOL_GPL(af_alg_release_parent);
147 149
148 static int alg_bind(struct socket *sock, struc 150 static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
149 { 151 {
150 const u32 allowed = CRYPTO_ALG_KERN_DR !! 152 const u32 forbidden = CRYPTO_ALG_INTERNAL;
151 struct sock *sk = sock->sk; 153 struct sock *sk = sock->sk;
152 struct alg_sock *ask = alg_sk(sk); 154 struct alg_sock *ask = alg_sk(sk);
153 struct sockaddr_alg_new *sa = (void *) !! 155 struct sockaddr_alg *sa = (void *)uaddr;
154 const struct af_alg_type *type; 156 const struct af_alg_type *type;
155 void *private; 157 void *private;
156 int err; 158 int err;
157 159
158 if (sock->state == SS_CONNECTED) 160 if (sock->state == SS_CONNECTED)
159 return -EINVAL; 161 return -EINVAL;
160 162
161 BUILD_BUG_ON(offsetof(struct sockaddr_ !! 163 if (addr_len != sizeof(*sa))
162 offsetof(struct sockaddr_ <<
163 BUILD_BUG_ON(offsetof(struct sockaddr_ <<
164 <<
165 if (addr_len < sizeof(*sa) + 1) <<
166 return -EINVAL; <<
167 <<
168 /* If caller uses non-allowed flag, re <<
169 if ((sa->salg_feat & ~allowed) || (sa- <<
170 return -EINVAL; 164 return -EINVAL;
171 165
172 sa->salg_type[sizeof(sa->salg_type) - 166 sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
173 sa->salg_name[addr_len - sizeof(*sa) - !! 167 sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
174 168
175 type = alg_get_type(sa->salg_type); 169 type = alg_get_type(sa->salg_type);
176 if (PTR_ERR(type) == -ENOENT) { !! 170 if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
177 request_module("algif-%s", sa- 171 request_module("algif-%s", sa->salg_type);
178 type = alg_get_type(sa->salg_t 172 type = alg_get_type(sa->salg_type);
179 } 173 }
180 174
181 if (IS_ERR(type)) 175 if (IS_ERR(type))
182 return PTR_ERR(type); 176 return PTR_ERR(type);
183 177
184 private = type->bind(sa->salg_name, sa !! 178 private = type->bind(sa->salg_name,
>> 179 sa->salg_feat & ~forbidden,
>> 180 sa->salg_mask & ~forbidden);
185 if (IS_ERR(private)) { 181 if (IS_ERR(private)) {
186 module_put(type->owner); 182 module_put(type->owner);
187 return PTR_ERR(private); 183 return PTR_ERR(private);
188 } 184 }
189 185
190 err = -EBUSY; 186 err = -EBUSY;
191 lock_sock(sk); 187 lock_sock(sk);
192 if (atomic_read(&ask->refcnt)) !! 188 if (ask->refcnt | ask->nokey_refcnt)
193 goto unlock; 189 goto unlock;
194 190
195 swap(ask->type, type); 191 swap(ask->type, type);
196 swap(ask->private, private); 192 swap(ask->private, private);
197 193
198 err = 0; 194 err = 0;
199 195
200 unlock: 196 unlock:
201 release_sock(sk); 197 release_sock(sk);
202 198
203 alg_do_release(type, private); 199 alg_do_release(type, private);
204 200
205 return err; 201 return err;
206 } 202 }
207 203
208 static int alg_setkey(struct sock *sk, sockptr !! 204 static int alg_setkey(struct sock *sk, char __user *ukey,
>> 205 unsigned int keylen)
209 { 206 {
210 struct alg_sock *ask = alg_sk(sk); 207 struct alg_sock *ask = alg_sk(sk);
211 const struct af_alg_type *type = ask-> 208 const struct af_alg_type *type = ask->type;
212 u8 *key; 209 u8 *key;
213 int err; 210 int err;
214 211
215 key = sock_kmalloc(sk, keylen, GFP_KER 212 key = sock_kmalloc(sk, keylen, GFP_KERNEL);
216 if (!key) 213 if (!key)
217 return -ENOMEM; 214 return -ENOMEM;
218 215
219 err = -EFAULT; 216 err = -EFAULT;
220 if (copy_from_sockptr(key, ukey, keyle !! 217 if (copy_from_user(key, ukey, keylen))
221 goto out; 218 goto out;
222 219
223 err = type->setkey(ask->private, key, 220 err = type->setkey(ask->private, key, keylen);
224 221
225 out: 222 out:
226 sock_kzfree_s(sk, key, keylen); 223 sock_kzfree_s(sk, key, keylen);
227 224
228 return err; 225 return err;
229 } 226 }
230 227
231 #ifdef CONFIG_KEYS <<
232 <<
233 static const u8 *key_data_ptr_user(const struc <<
234 unsigned in <<
235 { <<
236 const struct user_key_payload *ukp; <<
237 <<
238 ukp = user_key_payload_locked(key); <<
239 if (IS_ERR_OR_NULL(ukp)) <<
240 return ERR_PTR(-EKEYREVOKED); <<
241 <<
242 *datalen = key->datalen; <<
243 <<
244 return ukp->data; <<
245 } <<
246 <<
247 static const u8 *key_data_ptr_encrypted(const <<
248 unsign <<
249 { <<
250 const struct encrypted_key_payload *ek <<
251 <<
252 ekp = dereference_key_locked(key); <<
253 if (IS_ERR_OR_NULL(ekp)) <<
254 return ERR_PTR(-EKEYREVOKED); <<
255 <<
256 *datalen = ekp->decrypted_datalen; <<
257 <<
258 return ekp->decrypted_data; <<
259 } <<
260 <<
261 static const u8 *key_data_ptr_trusted(const st <<
262 unsigned <<
263 { <<
264 const struct trusted_key_payload *tkp; <<
265 <<
266 tkp = dereference_key_locked(key); <<
267 if (IS_ERR_OR_NULL(tkp)) <<
268 return ERR_PTR(-EKEYREVOKED); <<
269 <<
270 *datalen = tkp->key_len; <<
271 <<
272 return tkp->key; <<
273 } <<
274 <<
275 static struct key *lookup_key(key_serial_t ser <<
276 { <<
277 key_ref_t key_ref; <<
278 <<
279 key_ref = lookup_user_key(serial, 0, K <<
280 if (IS_ERR(key_ref)) <<
281 return ERR_CAST(key_ref); <<
282 <<
283 return key_ref_to_ptr(key_ref); <<
284 } <<
285 <<
286 static int alg_setkey_by_key_serial(struct alg <<
287 unsigned i <<
288 { <<
289 const struct af_alg_type *type = ask-> <<
290 u8 *key_data = NULL; <<
291 unsigned int key_datalen; <<
292 key_serial_t serial; <<
293 struct key *key; <<
294 const u8 *ret; <<
295 int err; <<
296 <<
297 if (optlen != sizeof(serial)) <<
298 return -EINVAL; <<
299 <<
300 if (copy_from_sockptr(&serial, optval, <<
301 return -EFAULT; <<
302 <<
303 key = lookup_key(serial); <<
304 if (IS_ERR(key)) <<
305 return PTR_ERR(key); <<
306 <<
307 down_read(&key->sem); <<
308 <<
309 ret = ERR_PTR(-ENOPROTOOPT); <<
310 if (!strcmp(key->type->name, "user") | <<
311 !strcmp(key->type->name, "logon")) <<
312 ret = key_data_ptr_user(key, & <<
313 } else if (IS_REACHABLE(CONFIG_ENCRYPT <<
314 !strcmp(key->type-> <<
315 ret = key_data_ptr_encrypted(k <<
316 } else if (IS_REACHABLE(CONFIG_TRUSTED <<
317 !strcmp(key->type-> <<
318 ret = key_data_ptr_trusted(key <<
319 } <<
320 <<
321 if (IS_ERR(ret)) { <<
322 up_read(&key->sem); <<
323 key_put(key); <<
324 return PTR_ERR(ret); <<
325 } <<
326 <<
327 key_data = sock_kmalloc(&ask->sk, key_ <<
328 if (!key_data) { <<
329 up_read(&key->sem); <<
330 key_put(key); <<
331 return -ENOMEM; <<
332 } <<
333 <<
334 memcpy(key_data, ret, key_datalen); <<
335 <<
336 up_read(&key->sem); <<
337 key_put(key); <<
338 <<
339 err = type->setkey(ask->private, key_d <<
340 <<
341 sock_kzfree_s(&ask->sk, key_data, key_ <<
342 <<
343 return err; <<
344 } <<
345 <<
346 #else <<
347 <<
348 static inline int alg_setkey_by_key_serial(str <<
349 soc <<
350 uns <<
351 { <<
352 return -ENOPROTOOPT; <<
353 } <<
354 <<
355 #endif <<
356 <<
357 static int alg_setsockopt(struct socket *sock, 228 static int alg_setsockopt(struct socket *sock, int level, int optname,
358 sockptr_t optval, un !! 229 char __user *optval, unsigned int optlen)
359 { 230 {
360 struct sock *sk = sock->sk; 231 struct sock *sk = sock->sk;
361 struct alg_sock *ask = alg_sk(sk); 232 struct alg_sock *ask = alg_sk(sk);
362 const struct af_alg_type *type; 233 const struct af_alg_type *type;
363 int err = -EBUSY; 234 int err = -EBUSY;
364 235
365 lock_sock(sk); 236 lock_sock(sk);
366 if (atomic_read(&ask->refcnt) != atomi !! 237 if (ask->refcnt)
367 goto unlock; 238 goto unlock;
368 239
369 type = ask->type; 240 type = ask->type;
370 241
371 err = -ENOPROTOOPT; 242 err = -ENOPROTOOPT;
372 if (level != SOL_ALG || !type) 243 if (level != SOL_ALG || !type)
373 goto unlock; 244 goto unlock;
374 245
375 switch (optname) { 246 switch (optname) {
376 case ALG_SET_KEY: 247 case ALG_SET_KEY:
377 case ALG_SET_KEY_BY_KEY_SERIAL: <<
378 if (sock->state == SS_CONNECTE 248 if (sock->state == SS_CONNECTED)
379 goto unlock; 249 goto unlock;
380 if (!type->setkey) 250 if (!type->setkey)
381 goto unlock; 251 goto unlock;
382 252
383 if (optname == ALG_SET_KEY_BY_ !! 253 err = alg_setkey(sk, optval, optlen);
384 err = alg_setkey_by_ke <<
385 else <<
386 err = alg_setkey(sk, o <<
387 break; 254 break;
388 case ALG_SET_AEAD_AUTHSIZE: 255 case ALG_SET_AEAD_AUTHSIZE:
389 if (sock->state == SS_CONNECTE 256 if (sock->state == SS_CONNECTED)
390 goto unlock; 257 goto unlock;
391 if (!type->setauthsize) 258 if (!type->setauthsize)
392 goto unlock; 259 goto unlock;
393 err = type->setauthsize(ask->p 260 err = type->setauthsize(ask->private, optlen);
394 break; <<
395 case ALG_SET_DRBG_ENTROPY: <<
396 if (sock->state == SS_CONNECTE <<
397 goto unlock; <<
398 if (!type->setentropy) <<
399 goto unlock; <<
400 <<
401 err = type->setentropy(ask->pr <<
402 } 261 }
403 262
404 unlock: 263 unlock:
405 release_sock(sk); 264 release_sock(sk);
406 265
407 return err; 266 return err;
408 } 267 }
409 268
410 int af_alg_accept(struct sock *sk, struct sock !! 269 int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern)
411 struct proto_accept_arg *arg <<
412 { 270 {
413 struct alg_sock *ask = alg_sk(sk); 271 struct alg_sock *ask = alg_sk(sk);
414 const struct af_alg_type *type; 272 const struct af_alg_type *type;
415 struct sock *sk2; 273 struct sock *sk2;
416 unsigned int nokey; 274 unsigned int nokey;
417 int err; 275 int err;
418 276
419 lock_sock(sk); 277 lock_sock(sk);
420 type = ask->type; 278 type = ask->type;
421 279
422 err = -EINVAL; 280 err = -EINVAL;
423 if (!type) 281 if (!type)
424 goto unlock; 282 goto unlock;
425 283
426 sk2 = sk_alloc(sock_net(sk), PF_ALG, G !! 284 sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto, kern);
427 err = -ENOMEM; 285 err = -ENOMEM;
428 if (!sk2) 286 if (!sk2)
429 goto unlock; 287 goto unlock;
430 288
431 sock_init_data(newsock, sk2); 289 sock_init_data(newsock, sk2);
432 security_sock_graft(sk2, newsock); !! 290 sock_graft(sk2, newsock);
433 security_sk_clone(sk, sk2); 291 security_sk_clone(sk, sk2);
434 292
435 /* <<
436 * newsock->ops assigned here to allow <<
437 * them when required. <<
438 */ <<
439 newsock->ops = type->ops; <<
440 err = type->accept(ask->private, sk2); 293 err = type->accept(ask->private, sk2);
441 294
442 nokey = err == -ENOKEY; 295 nokey = err == -ENOKEY;
443 if (nokey && type->accept_nokey) 296 if (nokey && type->accept_nokey)
444 err = type->accept_nokey(ask-> 297 err = type->accept_nokey(ask->private, sk2);
445 298
446 if (err) 299 if (err)
447 goto unlock; 300 goto unlock;
448 301
449 if (atomic_inc_return_relaxed(&ask->re !! 302 sk2->sk_family = PF_ALG;
>> 303
>> 304 if (nokey || !ask->refcnt++)
450 sock_hold(sk); 305 sock_hold(sk);
451 if (nokey) { !! 306 ask->nokey_refcnt += nokey;
452 atomic_inc(&ask->nokey_refcnt) <<
453 atomic_set(&alg_sk(sk2)->nokey <<
454 } <<
455 alg_sk(sk2)->parent = sk; 307 alg_sk(sk2)->parent = sk;
456 alg_sk(sk2)->type = type; 308 alg_sk(sk2)->type = type;
>> 309 alg_sk(sk2)->nokey_refcnt = nokey;
457 310
>> 311 newsock->ops = type->ops;
458 newsock->state = SS_CONNECTED; 312 newsock->state = SS_CONNECTED;
459 313
460 if (nokey) 314 if (nokey)
461 newsock->ops = type->ops_nokey 315 newsock->ops = type->ops_nokey;
462 316
463 err = 0; 317 err = 0;
464 318
465 unlock: 319 unlock:
466 release_sock(sk); 320 release_sock(sk);
467 321
468 return err; 322 return err;
469 } 323 }
470 EXPORT_SYMBOL_GPL(af_alg_accept); 324 EXPORT_SYMBOL_GPL(af_alg_accept);
471 325
472 static int alg_accept(struct socket *sock, str !! 326 static int alg_accept(struct socket *sock, struct socket *newsock, int flags,
473 struct proto_accept_arg !! 327 bool kern)
474 { 328 {
475 return af_alg_accept(sock->sk, newsock !! 329 return af_alg_accept(sock->sk, newsock, kern);
476 } 330 }
477 331
478 static const struct proto_ops alg_proto_ops = 332 static const struct proto_ops alg_proto_ops = {
479 .family = PF_ALG, 333 .family = PF_ALG,
480 .owner = THIS_MODULE, 334 .owner = THIS_MODULE,
481 335
482 .connect = sock_no_connec 336 .connect = sock_no_connect,
483 .socketpair = sock_no_socket 337 .socketpair = sock_no_socketpair,
484 .getname = sock_no_getnam 338 .getname = sock_no_getname,
485 .ioctl = sock_no_ioctl, 339 .ioctl = sock_no_ioctl,
486 .listen = sock_no_listen 340 .listen = sock_no_listen,
487 .shutdown = sock_no_shutdo 341 .shutdown = sock_no_shutdown,
>> 342 .getsockopt = sock_no_getsockopt,
488 .mmap = sock_no_mmap, 343 .mmap = sock_no_mmap,
>> 344 .sendpage = sock_no_sendpage,
489 .sendmsg = sock_no_sendms 345 .sendmsg = sock_no_sendmsg,
490 .recvmsg = sock_no_recvms 346 .recvmsg = sock_no_recvmsg,
>> 347 .poll = sock_no_poll,
491 348
492 .bind = alg_bind, 349 .bind = alg_bind,
493 .release = af_alg_release 350 .release = af_alg_release,
494 .setsockopt = alg_setsockopt 351 .setsockopt = alg_setsockopt,
495 .accept = alg_accept, 352 .accept = alg_accept,
496 }; 353 };
497 354
498 static void alg_sock_destruct(struct sock *sk) 355 static void alg_sock_destruct(struct sock *sk)
499 { 356 {
500 struct alg_sock *ask = alg_sk(sk); 357 struct alg_sock *ask = alg_sk(sk);
501 358
502 alg_do_release(ask->type, ask->private 359 alg_do_release(ask->type, ask->private);
503 } 360 }
504 361
505 static int alg_create(struct net *net, struct 362 static int alg_create(struct net *net, struct socket *sock, int protocol,
506 int kern) 363 int kern)
507 { 364 {
508 struct sock *sk; 365 struct sock *sk;
509 int err; 366 int err;
510 367
511 if (sock->type != SOCK_SEQPACKET) 368 if (sock->type != SOCK_SEQPACKET)
512 return -ESOCKTNOSUPPORT; 369 return -ESOCKTNOSUPPORT;
513 if (protocol != 0) 370 if (protocol != 0)
514 return -EPROTONOSUPPORT; 371 return -EPROTONOSUPPORT;
515 372
516 err = -ENOMEM; 373 err = -ENOMEM;
517 sk = sk_alloc(net, PF_ALG, GFP_KERNEL, 374 sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto, kern);
518 if (!sk) 375 if (!sk)
519 goto out; 376 goto out;
520 377
521 sock->ops = &alg_proto_ops; 378 sock->ops = &alg_proto_ops;
522 sock_init_data(sock, sk); 379 sock_init_data(sock, sk);
523 380
>> 381 sk->sk_family = PF_ALG;
524 sk->sk_destruct = alg_sock_destruct; 382 sk->sk_destruct = alg_sock_destruct;
525 383
526 return 0; 384 return 0;
527 out: 385 out:
528 return err; 386 return err;
529 } 387 }
530 388
531 static const struct net_proto_family alg_famil 389 static const struct net_proto_family alg_family = {
532 .family = PF_ALG, 390 .family = PF_ALG,
533 .create = alg_create, 391 .create = alg_create,
534 .owner = THIS_MODULE, 392 .owner = THIS_MODULE,
535 }; 393 };
536 394
537 static void af_alg_link_sg(struct af_alg_sgl * !! 395 int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
538 struct af_alg_sgl * <<
539 { 396 {
540 sg_unmark_end(sgl_prev->sgt.sgl + sgl_ !! 397 size_t off;
541 sg_chain(sgl_prev->sgt.sgl, sgl_prev-> !! 398 ssize_t n;
>> 399 int npages, i;
>> 400
>> 401 n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
>> 402 if (n < 0)
>> 403 return n;
>> 404
>> 405 npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
>> 406 if (WARN_ON(npages == 0))
>> 407 return -EINVAL;
>> 408 /* Add one extra for linking */
>> 409 sg_init_table(sgl->sg, npages + 1);
>> 410
>> 411 for (i = 0, len = n; i < npages; i++) {
>> 412 int plen = min_t(int, len, PAGE_SIZE - off);
>> 413
>> 414 sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
>> 415
>> 416 off = 0;
>> 417 len -= plen;
>> 418 }
>> 419 sg_mark_end(sgl->sg + npages - 1);
>> 420 sgl->npages = npages;
>> 421
>> 422 return n;
542 } 423 }
>> 424 EXPORT_SYMBOL_GPL(af_alg_make_sg);
>> 425
>> 426 void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
>> 427 {
>> 428 sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
>> 429 sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
>> 430 }
>> 431 EXPORT_SYMBOL_GPL(af_alg_link_sg);
543 432
544 void af_alg_free_sg(struct af_alg_sgl *sgl) 433 void af_alg_free_sg(struct af_alg_sgl *sgl)
545 { 434 {
546 int i; 435 int i;
547 436
548 if (sgl->sgt.sgl) { !! 437 for (i = 0; i < sgl->npages; i++)
549 if (sgl->need_unpin) !! 438 put_page(sgl->pages[i]);
550 for (i = 0; i < sgl->s <<
551 unpin_user_pag <<
552 if (sgl->sgt.sgl != sgl->sgl) <<
553 kvfree(sgl->sgt.sgl); <<
554 sgl->sgt.sgl = NULL; <<
555 } <<
556 } 439 }
557 EXPORT_SYMBOL_GPL(af_alg_free_sg); 440 EXPORT_SYMBOL_GPL(af_alg_free_sg);
558 441
559 static int af_alg_cmsg_send(struct msghdr *msg !! 442 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
560 { 443 {
561 struct cmsghdr *cmsg; 444 struct cmsghdr *cmsg;
562 445
563 for_each_cmsghdr(cmsg, msg) { 446 for_each_cmsghdr(cmsg, msg) {
564 if (!CMSG_OK(msg, cmsg)) 447 if (!CMSG_OK(msg, cmsg))
565 return -EINVAL; 448 return -EINVAL;
566 if (cmsg->cmsg_level != SOL_AL 449 if (cmsg->cmsg_level != SOL_ALG)
567 continue; 450 continue;
568 451
569 switch (cmsg->cmsg_type) { 452 switch (cmsg->cmsg_type) {
570 case ALG_SET_IV: 453 case ALG_SET_IV:
571 if (cmsg->cmsg_len < C 454 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
572 return -EINVAL 455 return -EINVAL;
573 con->iv = (void *)CMSG 456 con->iv = (void *)CMSG_DATA(cmsg);
574 if (cmsg->cmsg_len < C 457 if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
575 458 sizeof(*con->iv)))
576 return -EINVAL 459 return -EINVAL;
577 break; 460 break;
578 461
579 case ALG_SET_OP: 462 case ALG_SET_OP:
580 if (cmsg->cmsg_len < C 463 if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
581 return -EINVAL 464 return -EINVAL;
582 con->op = *(u32 *)CMSG 465 con->op = *(u32 *)CMSG_DATA(cmsg);
583 break; 466 break;
584 467
585 case ALG_SET_AEAD_ASSOCLEN: 468 case ALG_SET_AEAD_ASSOCLEN:
586 if (cmsg->cmsg_len < C 469 if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
587 return -EINVAL 470 return -EINVAL;
588 con->aead_assoclen = * 471 con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
589 break; 472 break;
590 473
591 default: 474 default:
592 return -EINVAL; 475 return -EINVAL;
593 } 476 }
594 } 477 }
595 478
596 return 0; 479 return 0;
597 } 480 }
>> 481 EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
598 482
599 /** !! 483 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
600 * af_alg_alloc_tsgl - allocate the TX SGL <<
601 * <<
602 * @sk: socket of connection to user space <<
603 * Return: 0 upon success, < 0 upon error <<
604 */ <<
605 static int af_alg_alloc_tsgl(struct sock *sk) <<
606 { <<
607 struct alg_sock *ask = alg_sk(sk); <<
608 struct af_alg_ctx *ctx = ask->private; <<
609 struct af_alg_tsgl *sgl; <<
610 struct scatterlist *sg = NULL; <<
611 <<
612 sgl = list_entry(ctx->tsgl_list.prev, <<
613 if (!list_empty(&ctx->tsgl_list)) <<
614 sg = sgl->sg; <<
615 <<
616 if (!sg || sgl->cur >= MAX_SGL_ENTS) { <<
617 sgl = sock_kmalloc(sk, <<
618 struct_size <<
619 GFP_KERNEL) <<
620 if (!sgl) <<
621 return -ENOMEM; <<
622 <<
623 sg_init_table(sgl->sg, MAX_SGL <<
624 sgl->cur = 0; <<
625 <<
626 if (sg) <<
627 sg_chain(sg, MAX_SGL_E <<
628 <<
629 list_add_tail(&sgl->list, &ctx <<
630 } <<
631 <<
632 return 0; <<
633 } <<
634 <<
635 /** <<
636 * af_alg_count_tsgl - Count number of TX SG e <<
637 * <<
638 * The counting starts from the beginning of t <<
639 * an @offset is provided, the counting of the <<
640 * <<
641 * @sk: socket of connection to user space <<
642 * @bytes: Count the number of SG entries hold <<
643 * @offset: Start the counting of SG entries f <<
644 * Return: Number of TX SG entries found given <<
645 */ <<
646 unsigned int af_alg_count_tsgl(struct sock *sk <<
647 { <<
648 const struct alg_sock *ask = alg_sk(sk <<
649 const struct af_alg_ctx *ctx = ask->pr <<
650 const struct af_alg_tsgl *sgl; <<
651 unsigned int i; <<
652 unsigned int sgl_count = 0; <<
653 <<
654 if (!bytes) <<
655 return 0; <<
656 <<
657 list_for_each_entry(sgl, &ctx->tsgl_li <<
658 const struct scatterlist *sg = <<
659 <<
660 for (i = 0; i < sgl->cur; i++) <<
661 size_t bytes_count; <<
662 <<
663 /* Skip offset */ <<
664 if (offset >= sg[i].le <<
665 offset -= sg[i <<
666 bytes -= sg[i] <<
667 continue; <<
668 } <<
669 <<
670 bytes_count = sg[i].le <<
671 <<
672 offset = 0; <<
673 sgl_count++; <<
674 <<
675 /* If we have seen req <<
676 if (bytes_count >= byt <<
677 return sgl_cou <<
678 <<
679 bytes -= bytes_count; <<
680 } <<
681 } <<
682 <<
683 return sgl_count; <<
684 } <<
685 EXPORT_SYMBOL_GPL(af_alg_count_tsgl); <<
686 <<
687 /** <<
688 * af_alg_pull_tsgl - Release the specified bu <<
689 * <<
690 * If @dst is non-null, reassign the pages to <<
691 * the pages. If @dst_offset is given only rea <<
692 * at the @dst_offset (byte). The caller must <<
693 * enough (e.g. by using af_alg_count_tsgl wit <<
694 * <<
695 * @sk: socket of connection to user space <<
696 * @used: Number of bytes to pull from TX SGL <<
697 * @dst: If non-NULL, buffer is reassigned to <<
698 * caller must release the buffers in ds <<
699 * @dst_offset: Reassign the TX SGL from given <<
700 * reaching the offset is release <<
701 */ <<
702 void af_alg_pull_tsgl(struct sock *sk, size_t <<
703 size_t dst_offset) <<
704 { <<
705 struct alg_sock *ask = alg_sk(sk); <<
706 struct af_alg_ctx *ctx = ask->private; <<
707 struct af_alg_tsgl *sgl; <<
708 struct scatterlist *sg; <<
709 unsigned int i, j = 0; <<
710 <<
711 while (!list_empty(&ctx->tsgl_list)) { <<
712 sgl = list_first_entry(&ctx->t <<
713 list); <<
714 sg = sgl->sg; <<
715 <<
716 for (i = 0; i < sgl->cur; i++) <<
717 size_t plen = min_t(si <<
718 struct page *page = sg <<
719 <<
720 if (!page) <<
721 continue; <<
722 <<
723 /* <<
724 * Assumption: caller <<
725 * SG entries in dst. <<
726 */ <<
727 if (dst) { <<
728 if (dst_offset <<
729 /* dis <<
730 dst_of <<
731 } else { <<
732 /* rea <<
733 get_pa <<
734 sg_set <<
735 <<
736 <<
737 dst_of <<
738 j++; <<
739 } <<
740 } <<
741 <<
742 sg[i].length -= plen; <<
743 sg[i].offset += plen; <<
744 <<
745 used -= plen; <<
746 ctx->used -= plen; <<
747 <<
748 if (sg[i].length) <<
749 return; <<
750 <<
751 put_page(page); <<
752 sg_assign_page(sg + i, <<
753 } <<
754 <<
755 list_del(&sgl->list); <<
756 sock_kfree_s(sk, sgl, struct_s <<
757 } <<
758 <<
759 if (!ctx->used) <<
760 ctx->merge = 0; <<
761 ctx->init = ctx->more; <<
762 } <<
763 EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); <<
764 <<
765 /** <<
766 * af_alg_free_areq_sgls - Release TX and RX S <<
767 * <<
768 * @areq: Request holding the TX and RX SGL <<
769 */ <<
770 static void af_alg_free_areq_sgls(struct af_al <<
771 { <<
772 struct sock *sk = areq->sk; <<
773 struct alg_sock *ask = alg_sk(sk); <<
774 struct af_alg_ctx *ctx = ask->private; <<
775 struct af_alg_rsgl *rsgl, *tmp; <<
776 struct scatterlist *tsgl; <<
777 struct scatterlist *sg; <<
778 unsigned int i; <<
779 <<
780 list_for_each_entry_safe(rsgl, tmp, &a <<
781 atomic_sub(rsgl->sg_num_bytes, <<
782 af_alg_free_sg(&rsgl->sgl); <<
783 list_del(&rsgl->list); <<
784 if (rsgl != &areq->first_rsgl) <<
785 sock_kfree_s(sk, rsgl, <<
786 } <<
787 <<
788 tsgl = areq->tsgl; <<
789 if (tsgl) { <<
790 for_each_sg(tsgl, sg, areq->ts <<
791 if (!sg_page(sg)) <<
792 continue; <<
793 put_page(sg_page(sg)); <<
794 } <<
795 <<
796 sock_kfree_s(sk, tsgl, areq->t <<
797 } <<
798 } <<
799 <<
800 /** <<
801 * af_alg_wait_for_wmem - wait for availabilit <<
802 * <<
803 * @sk: socket of connection to user space <<
804 * @flags: If MSG_DONTWAIT is set, then only r <<
805 * Return: 0 when writable memory is available <<
806 */ <<
807 static int af_alg_wait_for_wmem(struct sock *s <<
808 { <<
809 DEFINE_WAIT_FUNC(wait, woken_wake_func <<
810 int err = -ERESTARTSYS; <<
811 long timeout; <<
812 <<
813 if (flags & MSG_DONTWAIT) <<
814 return -EAGAIN; <<
815 <<
816 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); <<
817 <<
818 add_wait_queue(sk_sleep(sk), &wait); <<
819 for (;;) { <<
820 if (signal_pending(current)) <<
821 break; <<
822 timeout = MAX_SCHEDULE_TIMEOUT <<
823 if (sk_wait_event(sk, &timeout <<
824 err = 0; <<
825 break; <<
826 } <<
827 } <<
828 remove_wait_queue(sk_sleep(sk), &wait) <<
829 <<
830 return err; <<
831 } <<
832 <<
833 /** <<
834 * af_alg_wmem_wakeup - wakeup caller when wri <<
835 * <<
836 * @sk: socket of connection to user space <<
837 */ <<
838 void af_alg_wmem_wakeup(struct sock *sk) <<
839 { <<
840 struct socket_wq *wq; <<
841 <<
842 if (!af_alg_writable(sk)) <<
843 return; <<
844 <<
845 rcu_read_lock(); <<
846 wq = rcu_dereference(sk->sk_wq); <<
847 if (skwq_has_sleeper(wq)) <<
848 wake_up_interruptible_sync_pol <<
849 <<
850 <<
851 sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, <<
852 rcu_read_unlock(); <<
853 } <<
854 EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); <<
855 <<
856 /** <<
857 * af_alg_wait_for_data - wait for availabilit <<
858 * <<
859 * @sk: socket of connection to user space <<
860 * @flags: If MSG_DONTWAIT is set, then only r <<
861 * @min: Set to minimum request size if partia <<
862 * Return: 0 when writable memory is available <<
863 */ <<
864 int af_alg_wait_for_data(struct sock *sk, unsi <<
865 { 484 {
866 DEFINE_WAIT_FUNC(wait, woken_wake_func !! 485 switch (err) {
867 struct alg_sock *ask = alg_sk(sk); !! 486 case -EINPROGRESS:
868 struct af_alg_ctx *ctx = ask->private; !! 487 case -EBUSY:
869 long timeout; !! 488 wait_for_completion(&completion->completion);
870 int err = -ERESTARTSYS; !! 489 reinit_completion(&completion->completion);
871 !! 490 err = completion->err;
872 if (flags & MSG_DONTWAIT) !! 491 break;
873 return -EAGAIN; !! 492 };
874 <<
875 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); <<
876 <<
877 add_wait_queue(sk_sleep(sk), &wait); <<
878 for (;;) { <<
879 if (signal_pending(current)) <<
880 break; <<
881 timeout = MAX_SCHEDULE_TIMEOUT <<
882 if (sk_wait_event(sk, &timeout <<
883 ctx->init && <<
884 <<
885 &wait)) { <<
886 err = 0; <<
887 break; <<
888 } <<
889 } <<
890 remove_wait_queue(sk_sleep(sk), &wait) <<
891 <<
892 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk <<
893 493
894 return err; 494 return err;
895 } 495 }
896 EXPORT_SYMBOL_GPL(af_alg_wait_for_data); !! 496 EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
897 497
898 /** !! 498 void af_alg_complete(struct crypto_async_request *req, int err)
899 * af_alg_data_wakeup - wakeup caller when new <<
900 * <<
901 * @sk: socket of connection to user space <<
902 */ <<
903 static void af_alg_data_wakeup(struct sock *sk <<
904 { 499 {
905 struct alg_sock *ask = alg_sk(sk); !! 500 struct af_alg_completion *completion = req->data;
906 struct af_alg_ctx *ctx = ask->private; <<
907 struct socket_wq *wq; <<
908 501
909 if (!ctx->used) !! 502 if (err == -EINPROGRESS)
910 return; 503 return;
911 504
912 rcu_read_lock(); !! 505 completion->err = err;
913 wq = rcu_dereference(sk->sk_wq); !! 506 complete(&completion->completion);
914 if (skwq_has_sleeper(wq)) <<
915 wake_up_interruptible_sync_pol <<
916 <<
917 <<
918 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, <<
919 rcu_read_unlock(); <<
920 } <<
921 <<
922 /** <<
923 * af_alg_sendmsg - implementation of sendmsg <<
924 * <<
925 * The sendmsg system call handler obtains the <<
926 * in ctx->tsgl_list. This implies allocation <<
927 * struct af_alg_tsgl. <<
928 * <<
929 * In addition, the ctx is filled with the inf <<
930 * <<
931 * @sock: socket of connection to user space <<
932 * @msg: message from user space <<
933 * @size: size of message from user space <<
934 * @ivsize: the size of the IV for the cipher <<
935 * user-space-provided IV has the righ <<
936 * Return: the number of copied data upon succ <<
937 */ <<
938 int af_alg_sendmsg(struct socket *sock, struct <<
939 unsigned int ivsize) <<
940 { <<
941 struct sock *sk = sock->sk; <<
942 struct alg_sock *ask = alg_sk(sk); <<
943 struct af_alg_ctx *ctx = ask->private; <<
944 struct af_alg_tsgl *sgl; <<
945 struct af_alg_control con = {}; <<
946 long copied = 0; <<
947 bool enc = false; <<
948 bool init = false; <<
949 int err = 0; <<
950 <<
951 if (msg->msg_controllen) { <<
952 err = af_alg_cmsg_send(msg, &c <<
953 if (err) <<
954 return err; <<
955 <<
956 init = true; <<
957 switch (con.op) { <<
958 case ALG_OP_ENCRYPT: <<
959 enc = true; <<
960 break; <<
961 case ALG_OP_DECRYPT: <<
962 enc = false; <<
963 break; <<
964 default: <<
965 return -EINVAL; <<
966 } <<
967 <<
968 if (con.iv && con.iv->ivlen != <<
969 return -EINVAL; <<
970 } <<
971 <<
972 lock_sock(sk); <<
973 if (ctx->init && !ctx->more) { <<
974 if (ctx->used) { <<
975 err = -EINVAL; <<
976 goto unlock; <<
977 } <<
978 <<
979 pr_info_once( <<
980 "%s sent an empty cont <<
981 current->comm); <<
982 } <<
983 ctx->init = true; <<
984 <<
985 if (init) { <<
986 ctx->enc = enc; <<
987 if (con.iv) <<
988 memcpy(ctx->iv, con.iv <<
989 <<
990 ctx->aead_assoclen = con.aead_ <<
991 } <<
992 <<
993 while (size) { <<
994 struct scatterlist *sg; <<
995 size_t len = size; <<
996 ssize_t plen; <<
997 <<
998 /* use the existing memory in <<
999 if (ctx->merge && !(msg->msg_f <<
1000 sgl = list_entry(ctx- <<
1001 stru <<
1002 sg = sgl->sg + sgl->c <<
1003 len = min_t(size_t, l <<
1004 PAGE_SIZE <<
1005 <<
1006 err = memcpy_from_msg <<
1007 <<
1008 <<
1009 if (err) <<
1010 goto unlock; <<
1011 <<
1012 sg->length += len; <<
1013 ctx->merge = (sg->off <<
1014 (PAGE_SI <<
1015 <<
1016 ctx->used += len; <<
1017 copied += len; <<
1018 size -= len; <<
1019 continue; <<
1020 } <<
1021 <<
1022 if (!af_alg_writable(sk)) { <<
1023 err = af_alg_wait_for <<
1024 if (err) <<
1025 goto unlock; <<
1026 } <<
1027 <<
1028 /* allocate a new page */ <<
1029 len = min_t(unsigned long, le <<
1030 <<
1031 err = af_alg_alloc_tsgl(sk); <<
1032 if (err) <<
1033 goto unlock; <<
1034 <<
1035 sgl = list_entry(ctx->tsgl_li <<
1036 list); <<
1037 sg = sgl->sg; <<
1038 if (sgl->cur) <<
1039 sg_unmark_end(sg + sg <<
1040 <<
1041 if (msg->msg_flags & MSG_SPLI <<
1042 struct sg_table sgtab <<
1043 .sgl <<
1044 .nents <<
1045 .orig_nents <<
1046 }; <<
1047 <<
1048 plen = extract_iter_t <<
1049 <<
1050 if (plen < 0) { <<
1051 err = plen; <<
1052 goto unlock; <<
1053 } <<
1054 <<
1055 for (; sgl->cur < sgt <<
1056 get_page(sg_p <<
1057 len -= plen; <<
1058 ctx->used += plen; <<
1059 copied += plen; <<
1060 size -= plen; <<
1061 ctx->merge = 0; <<
1062 } else { <<
1063 do { <<
1064 struct page * <<
1065 unsigned int <<
1066 <<
1067 plen = min_t( <<
1068 <<
1069 pg = alloc_pa <<
1070 if (!pg) { <<
1071 err = <<
1072 goto <<
1073 } <<
1074 <<
1075 sg_assign_pag <<
1076 <<
1077 err = memcpy_ <<
1078 page_ <<
1079 msg, <<
1080 if (err) { <<
1081 __fre <<
1082 sg_as <<
1083 goto <<
1084 } <<
1085 <<
1086 sg[i].length <<
1087 len -= plen; <<
1088 ctx->used += <<
1089 copied += ple <<
1090 size -= plen; <<
1091 sgl->cur++; <<
1092 } while (len && sgl-> <<
1093 <<
1094 ctx->merge = plen & ( <<
1095 } <<
1096 <<
1097 if (!size) <<
1098 sg_mark_end(sg + sgl- <<
1099 } <<
1100 <<
1101 err = 0; <<
1102 <<
1103 ctx->more = msg->msg_flags & MSG_MORE <<
1104 <<
1105 unlock: <<
1106 af_alg_data_wakeup(sk); <<
1107 release_sock(sk); <<
1108 <<
1109 return copied ?: err; <<
1110 } <<
1111 EXPORT_SYMBOL_GPL(af_alg_sendmsg); <<
1112 <<
1113 /** <<
1114 * af_alg_free_resources - release resources <<
1115 * @areq: Request holding the TX and RX SGL <<
1116 */ <<
1117 void af_alg_free_resources(struct af_alg_asyn <<
1118 { <<
1119 struct sock *sk = areq->sk; <<
1120 struct af_alg_ctx *ctx; <<
1121 <<
1122 af_alg_free_areq_sgls(areq); <<
1123 sock_kfree_s(sk, areq, areq->areqlen) <<
1124 <<
1125 ctx = alg_sk(sk)->private; <<
1126 ctx->inflight = false; <<
1127 } <<
1128 EXPORT_SYMBOL_GPL(af_alg_free_resources); <<
1129 <<
1130 /** <<
1131 * af_alg_async_cb - AIO callback handler <<
1132 * @data: async request completion data <<
1133 * @err: if non-zero, error result to be retu <<
1134 * otherwise return the AIO output leng <<
1135 * <<
1136 * This handler cleans up the struct af_alg_a <<
1137 * AIO operation. <<
1138 * <<
1139 * The number of bytes to be generated with t <<
1140 * in areq->outlen before the AIO callback ha <<
1141 */ <<
1142 void af_alg_async_cb(void *data, int err) <<
1143 { <<
1144 struct af_alg_async_req *areq = data; <<
1145 struct sock *sk = areq->sk; <<
1146 struct kiocb *iocb = areq->iocb; <<
1147 unsigned int resultlen; <<
1148 <<
1149 /* Buffer size written by crypto oper <<
1150 resultlen = areq->outlen; <<
1151 <<
1152 af_alg_free_resources(areq); <<
1153 sock_put(sk); <<
1154 <<
1155 iocb->ki_complete(iocb, err ? err : ( <<
1156 } <<
1157 EXPORT_SYMBOL_GPL(af_alg_async_cb); <<
1158 <<
1159 /** <<
1160 * af_alg_poll - poll system call handler <<
1161 * @file: file pointer <<
1162 * @sock: socket to poll <<
1163 * @wait: poll_table <<
1164 */ <<
1165 __poll_t af_alg_poll(struct file *file, struc <<
1166 poll_table *wait) <<
1167 { <<
1168 struct sock *sk = sock->sk; <<
1169 struct alg_sock *ask = alg_sk(sk); <<
1170 struct af_alg_ctx *ctx = ask->private <<
1171 __poll_t mask; <<
1172 <<
1173 sock_poll_wait(file, sock, wait); <<
1174 mask = 0; <<
1175 <<
1176 if (!ctx->more || ctx->used) <<
1177 mask |= EPOLLIN | EPOLLRDNORM <<
1178 <<
1179 if (af_alg_writable(sk)) <<
1180 mask |= EPOLLOUT | EPOLLWRNOR <<
1181 <<
1182 return mask; <<
1183 } <<
1184 EXPORT_SYMBOL_GPL(af_alg_poll); <<
1185 <<
1186 /** <<
1187 * af_alg_alloc_areq - allocate struct af_alg <<
1188 * <<
1189 * @sk: socket of connection to user space <<
1190 * @areqlen: size of struct af_alg_async_req <<
1191 * Return: allocated data structure or ERR_PT <<
1192 */ <<
1193 struct af_alg_async_req *af_alg_alloc_areq(st <<
1194 un <<
1195 { <<
1196 struct af_alg_ctx *ctx = alg_sk(sk)-> <<
1197 struct af_alg_async_req *areq; <<
1198 <<
1199 /* Only one AIO request can be in fli <<
1200 if (ctx->inflight) <<
1201 return ERR_PTR(-EBUSY); <<
1202 <<
1203 areq = sock_kmalloc(sk, areqlen, GFP_ <<
1204 if (unlikely(!areq)) <<
1205 return ERR_PTR(-ENOMEM); <<
1206 <<
1207 ctx->inflight = true; <<
1208 <<
1209 areq->areqlen = areqlen; <<
1210 areq->sk = sk; <<
1211 areq->first_rsgl.sgl.sgt.sgl = areq-> <<
1212 areq->last_rsgl = NULL; <<
1213 INIT_LIST_HEAD(&areq->rsgl_list); <<
1214 areq->tsgl = NULL; <<
1215 areq->tsgl_entries = 0; <<
1216 <<
1217 return areq; <<
1218 } <<
1219 EXPORT_SYMBOL_GPL(af_alg_alloc_areq); <<
1220 <<
1221 /** <<
1222 * af_alg_get_rsgl - create the RX SGL for th <<
1223 * operation <<
1224 * <<
1225 * @sk: socket of connection to user space <<
1226 * @msg: user space message <<
1227 * @flags: flags used to invoke recvmsg with <<
1228 * @areq: instance of the cryptographic reque <<
1229 * @maxsize: maximum number of bytes to be pu <<
1230 * @outlen: number of bytes in the RX SGL <<
1231 * Return: 0 on success, < 0 upon error <<
1232 */ <<
1233 int af_alg_get_rsgl(struct sock *sk, struct m <<
1234 struct af_alg_async_req * <<
1235 size_t *outlen) <<
1236 { <<
1237 struct alg_sock *ask = alg_sk(sk); <<
1238 struct af_alg_ctx *ctx = ask->private <<
1239 size_t len = 0; <<
1240 <<
1241 while (maxsize > len && msg_data_left <<
1242 struct af_alg_rsgl *rsgl; <<
1243 ssize_t err; <<
1244 size_t seglen; <<
1245 <<
1246 /* limit the amount of readab <<
1247 if (!af_alg_readable(sk)) <<
1248 break; <<
1249 <<
1250 seglen = min_t(size_t, (maxsi <<
1251 msg_data_left( <<
1252 <<
1253 if (list_empty(&areq->rsgl_li <<
1254 rsgl = &areq->first_r <<
1255 } else { <<
1256 rsgl = sock_kmalloc(s <<
1257 if (unlikely(!rsgl)) <<
1258 return -ENOME <<
1259 } <<
1260 <<
1261 rsgl->sgl.need_unpin = <<
1262 iov_iter_extract_will <<
1263 rsgl->sgl.sgt.sgl = rsgl->sgl <<
1264 rsgl->sgl.sgt.nents = 0; <<
1265 rsgl->sgl.sgt.orig_nents = 0; <<
1266 list_add_tail(&rsgl->list, &a <<
1267 <<
1268 sg_init_table(rsgl->sgl.sgt.s <<
1269 err = extract_iter_to_sg(&msg <<
1270 ALG_ <<
1271 if (err < 0) { <<
1272 rsgl->sg_num_bytes = <<
1273 return err; <<
1274 } <<
1275 <<
1276 sg_mark_end(rsgl->sgl.sgt.sgl <<
1277 <<
1278 /* chain the new scatterlist <<
1279 if (areq->last_rsgl) <<
1280 af_alg_link_sg(&areq- <<
1281 <<
1282 areq->last_rsgl = rsgl; <<
1283 len += err; <<
1284 atomic_add(err, &ctx->rcvused <<
1285 rsgl->sg_num_bytes = err; <<
1286 } <<
1287 <<
1288 *outlen = len; <<
1289 return 0; <<
1290 } 507 }
1291 EXPORT_SYMBOL_GPL(af_alg_get_rsgl); !! 508 EXPORT_SYMBOL_GPL(af_alg_complete);
1292 509
1293 static int __init af_alg_init(void) 510 static int __init af_alg_init(void)
1294 { 511 {
1295 int err = proto_register(&alg_proto, 512 int err = proto_register(&alg_proto, 0);
1296 513
1297 if (err) 514 if (err)
1298 goto out; 515 goto out;
1299 516
1300 err = sock_register(&alg_family); 517 err = sock_register(&alg_family);
1301 if (err != 0) 518 if (err != 0)
1302 goto out_unregister_proto; 519 goto out_unregister_proto;
1303 520
1304 out: 521 out:
1305 return err; 522 return err;
1306 523
1307 out_unregister_proto: 524 out_unregister_proto:
1308 proto_unregister(&alg_proto); 525 proto_unregister(&alg_proto);
1309 goto out; 526 goto out;
1310 } 527 }
1311 528
1312 static void __exit af_alg_exit(void) 529 static void __exit af_alg_exit(void)
1313 { 530 {
1314 sock_unregister(PF_ALG); 531 sock_unregister(PF_ALG);
1315 proto_unregister(&alg_proto); 532 proto_unregister(&alg_proto);
1316 } 533 }
1317 534
1318 module_init(af_alg_init); 535 module_init(af_alg_init);
1319 module_exit(af_alg_exit); 536 module_exit(af_alg_exit);
1320 MODULE_DESCRIPTION("Crypto userspace interfac <<
1321 MODULE_LICENSE("GPL"); 537 MODULE_LICENSE("GPL");
1322 MODULE_ALIAS_NETPROTO(AF_ALG); 538 MODULE_ALIAS_NETPROTO(AF_ALG);
1323 539
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